<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <div id ="app">
   <ul>
    <li v-for="(item,index) in arr">
      {{index}}--{{item}}
    </li>
   </ul>
  </div>
  <script src="/js/vue.js"></script> 
  <script>
    const app =new Vue({
      el:'#app',
      data:{
        arr:[
          1,2,3,4,5,6,7
        ]
      }
    
    })
  </script>
</body>
</html>